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用CO_2红外激光治疗多种皮肤病症,疗效显著。但激光器发出的高强度激光束必须经过扩散才能达到治疗的要求。采用锗单晶透镜,能量损耗多,镜片材料价格昂贵,且难于加工。采用反射镜,效率高,成本低。凹面反射镜又不如凸面反射镜好。但一般的单曲率球面反射镜在将激光束折过90°角反射后,圆形光斑被畸变成椭圆形,能量分布极不均匀。经推证及试验表明,采用双曲率椭球面反射镜,可以克服上述缺点。镜片的两个互相垂直的截面上曲率之比按1:2左右制作,可使折过90°角反射的激光束在扩散后仍保持圆形。
CO_2 infrared laser treatment of a variety of skin disorders, a significant effect. However, high-intensity laser beams emitted by the laser must be diffused to meet therapeutic requirements. The use of germanium single crystal lens, energy loss, lens materials, expensive, and difficult to process. The use of mirrors, high efficiency, low cost. Concave mirrors are not as good as convex mirrors. However, the general single-curvature spherical mirror in the laser beam angle of 90 ° after the reflection, the circular spot is distorted into an oval, the energy distribution is extremely uneven. Proved and tested show that the use of hyperbolic ellipsoid mirror, you can overcome the above shortcomings. The curvature of the two perpendicular cross-sections of the lens is made in a ratio of about 1: 2 so that a laser beam reflected at a 90 ° angle remains circular after diffusion.